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ClassCastException when calling DavMail from Thunderbird/Lightning.

After rebooting my Ubuntu system, when Thunderbird/lightning starts up I get the ClassCastException error in the davmail.log shown below. The error occurs every time I attempt to sync my calendar.

I'm running Ubuntu 14.04, Thunderbird 24.5.0, and DavMail 4.4.1-2225, all installed via apt-get. This was definitely working before I rebooted but I don't know what I could have done to break it. I'm sure I didn't explicitly change any Thunderbird or DavMail settings. The reboot was required by a normal update of Ubuntu. The log is in /tmp and unfortunately the old (working) log was deleted on the reboot.